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lib/runtime/SetAnonymousDefaultNameRuntimeModule.js
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Xiao
perf(runtime): skip IIFE wrapping for RuntimeModules without locals (#21633)
09 авг 2026, 17:30
Не верифицирован
09 авг 2026, 17:30
22b12df
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/* MIT License http://www.opensource.org/licenses/mit-license.php */ "use strict"; const RuntimeGlobals = require("../RuntimeGlobals"); const Template = require("../Template"); const HelperRuntimeModule = require("./HelperRuntimeModule"); /** @typedef {import("../Compilation")} Compilation */ class SetAnonymousDefaultNameRuntimeModule extends HelperRuntimeModule { constructor() { super("set anonymous default export name"); } /** * Returns true, if the runtime module should get it's own scope. * When false, `generate()` must emit complete statements ending with `;` * so a following runtime IIFE is not parsed as a call (ASI). * @returns {boolean} true, if the runtime module should get it's own scope */ shouldIsolate() { return false; } /** * Generates runtime code for this runtime module. * @returns {string | null} runtime code */ generate() { const compilation = /** @type {Compilation} */ (this.compilation); const { runtimeTemplate } = compilation; const fn = RuntimeGlobals.setAnonymousDefaultName; return Template.asString([ "// set .name for anonymous default exports per ES spec", "// skipped when the property is non-configurable (pre-ES2015 engines),", "// where Object.defineProperty would throw", `${fn} = ${runtimeTemplate.basicFunction("x", [ 'var descriptor = Object.getOwnPropertyDescriptor(x, "name");', 'if (!descriptor || (!descriptor.writable && descriptor.configurable)) Object.defineProperty(x, "name", { value: "default", configurable: true });' ])};` ]); } } module.exports = SetAnonymousDefaultNameRuntimeModule;